Add adaptive dogfood icon and fix the icon background color

New icon assets are pushed here: cl/151068275
Use the color #2458CA as the icon background
Changes are only for O

Bug: 36692044
Bug: 34128487

Test: Tested on Nexus 5 with L and Pixel with O for both GoogleContacts
build and GoogleDogfood build

Change-Id: Ia47aac48eaec64e336b9e42790c89dde054ac8d0